In the present initiative, we have shown how to improve the bias of a classical lightweight cipher called SIMON in linear cryptanalysis exploiting CHSH game. In the domain of Quantum Cryptanalysis on Symmetric Ciphers we mainly study the impact of Grover's search algorithm [1]}, Simon period finding algorithm [2]} and the combination of both on block ciphers. It is also shown that classically secure ciphers can be broken with quantum algorithms.
Quantum algorithm can be used to speed up classical attacks too.
